jewett



(No Model.)

E. F. JEWETT.

ADDING MACHINE.

10.446,753. Patented Peb. 17,1891.

A TTOHNEYS UNITED STATES PATENT OEEICE.

ERI l". JEWETT, OF Nll\\"l`O\VN, OlllO, ASSIGNOR, DY MESNE ASSTGNMENTS,TO PERCY L. JFVFTT, OF SAME PLACE.

ADDlNG-MACHlNE.

SPECIFICATION forming part of Letters Patent No. 446,753, dated February17', 1891.

Application filed April 23, 1890. Serial No. 349,068. (No model.)

To @ZZ 2071/071@ if may concern:

De it known that l, ERI F. JEWETT, of Newtown, in the county of Hamiltonand State of Ohio, have invented a new andL Improved Adding-lllzichine,of which the following is a full, clear, and exact description.

)ly invention relates to improvements in adding-machines; and the objectof my invention is to produce a machine by means of to which numbersniay be rapidly and accurately added or subtracted in a mechanicalmanner requiring little mental process.

To this end my invention consists in certain features of constructionand combinations of parts, which will be hereinafter fully described,and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicate 2ocorresponding parts in all the figures.

Figure lis a front elevation of the machine as arranged for adding, Fig.i), a front elevation, partly in section, with a portion broken away toshow the tapes and with the machine arranged for subtracting, and Fig. 3a vertical cross-section on the line n; of Fig. l.

The hollow case A, which is preferably rectangular in form, constitutesthe frame of the machine, and fixed in the upper and lower 3o portionsof the case, respectively, are the horizontal shafts i3 and B, havingloosely mounted thereon a series ot similar independent pulleys C, withten pins d projecting from the faces thereof, and with every tenth pin aupon the upper pulleys longer than the rest.

The pins are spaced regularly upon the pulleys C, and each pulley on theshaft D aligns with a corresponding pulley on the shaft i3'.

Fixed 'in the case A below the shaft D is a 4o horizontal bar D,extending across the case, being fixed in position by the screws l),which project through the sides of the case and into the ends of thebar, Fixed to the front side of the bar D is a plate D', which fills thefront central portion of the case A, and in the front surface of whichare cut ten shallow grooves D2, corresponding in their position anddirection with the slots in the plates ll and card .T. The grooves guidethe point 5c of the pencil or instrument for moving said parts. Theplate D' serves as a table to prevent the numbered tapes from beingpressed too far inward when the device is operated. Attached to the backside of the bar D are the upwardly-extending tongues (l, there being asmany tongues less one as there are pulleys C on the shaft l. lhe tonguesalign with the pulleys and extend just near enough thereto to permit thepins c to pass and to engage the longer pins c', which will strike thetongues when the pulleys are revolved, thus producing a ringing soundand warning the operator that there is one to carry, as described below.

Extending over the pulleys O are the endless tapes E, havingperforations e to fit the pins of the pulleys, and perforations c', bymeans of which the tapes are moved, and having'spaced regularly thereonthree or more consecutive series of numerals from O to 9. The numeralson the tapes E are only visible one at a time as they appear in thetransverse slot F in the face of the case A. A plate ll, havinglongitudinal slotsf therein, is fixed in the front of the case A, andthe slots are arranged to be opposite the perforations c in the tapes E,so that a pointed instrument may be inserted in said perforations andthe tapes moved. ln the vertical bars Il' of the plate ll are a seriesof holes g, spaced regnlarl-y and arranged one above the other, therebeing ten holes in each bar. The bars Il' are in line with the tapes E,and between the tapes and the plate ll is a card J, having a perforation7i. in the lower part thereof opposite the slot 7i in the face of thecase A, and by means of which the card may be moved vertically. The cardhas longitudinal slots j therein, corresponding to the slots f in theplate ll, and vertical bars J", between the slots, corresponding to thevertical bars ll of the plate ll. The bars J will thus be concealed bythe bars F', except the parts which show through the holes g of the barsH'. The bars J have printed thereon two series of numerals from 0 to El,as shown in Fig. i?, the numbers alternating and one series reading fromtop to bottom and the other from bottom to top, and two numerals, one ofeach series, corresponding in position with a numeral on the tapes E, sothat by moving the' card .I either series may be brought opposite theholes g. The numerals reading from bottom to top arc displayed when themachine is used for adding and the opposite series when the machine isused for subtracting. The different series l of numerals should beprinted in differentcolored ink to make the distinction more noticeable.The right-hand column of numer- IO als represents units, the next tens,the next hundreds, and so on, as in ordinary notation. The machine isoperated as follows: If the machine is to be used for adding, a pointedinstrumement-such, for instance, as a lead- I5 pencil-is inserted in theperforation h and the card J moved to bring the numerals opposite theholes g in the bars ll in such a manner that they will read from bottomto top, and the tapes E are turned by inserting zo the pencil in theperforations e,so that a row of ciphers will appear in the slot F. Wewill suppose that the three numbers 223, 179, and 8&5 are to be added.Beginning with the figure in the units-,column of the last number 5 the2 5 operator places his pencil in a perforation e of the tape E oppositethe numeral as displayed in the right-hand or units column on themachine, and moves the pencil and tape to the bottom of the slot f. Thiscauses the 3o numeral 5 to appear in the units-column of the slot F. Thepencil is then placed in a perforation of the tape opposite the'numeral9, that 'being the next numeral to be added, and the tape drawn to thebottom of the slot f,.as before, and this causes the numeral il toappear in the units-column of the slot F; but the right-hand pulley willhave completed a revolution during this last movement and the pin a willhave struck a tongue d, warning the operator that there is one to carry.The pencil is therefore inserted in a perforation of the tape oppositethe Fig.1 in the tens-column and the tape and pencil moved to the bottomof the slot f, and this causes the numeral l to appear'in thetens-column of the slot F. The operator then inserts the pencil oppositethe numeral 3 in the units-column of the machine, and the tape andpencil are again carried to the bottom of the slot f,-thus causing thenumeral 7 to appear in the unitscolumn of the slot F. The numerals 4f,7, and .2 being the numerals 'in the tens-column of the numbers to beadded, are then added in the tens-column of the machine in the ,man- 5 5ner described, the amount to carry transferred to the hundreds-column ofthe machine, and l the hundreds are added in the same way, and the finalresult 1,247 will appear in the slot F.

It will be readily seen that as each tape and 6o set of pulleys kareindependent from the others the operation may be carried onindefinitely, being only limited by .the number of tapes vandcorresponding parts in the machine. i To subtract, the above process isreversed, I 6-5 the, card J 1s moved upwardly, so that the.

numeralsin the holes gwill read from top to bottom, and instead of therow of ciphers in als produced thereon, and a slotted-and apg the slot Fthe minuend is made to appear in the right-hand side of the slot. 'lheoperator then places his pencil in the perforations of 7o the tapesopposite the numerals of the units, tens, &c., corresponding to thenumerals in similar columns of the subtrahend, and moves the tapesupwardly, carrying as in addition, but upwardly, and the remainderappears in the slot F. A

Byhaving the parts arranged as described the machine will be perfectlyaccurate in its work, and with a little practice a person may operate itwith great facility. So

I have shown the machine as arranged for a small device; but in largermachines, for school use, projecting buttons maybe substituted for theperforatious e and h, and the tongues d may be substituted by levers andmade to-strike a gong or bell.

Having thus described my invention, what I claim as new, and desiretosecure by Letters Patent, is

l. An adding-machine consisting, essentially, of a case having atransverse slot therein and having two horizontal shafts fixed therein,pin-pulleys mounted on said shafts so that the pulleys on the upper andlower shafts will align, endless tapes extending over said pulleys,having series of digits and ciphers thereon, a vertically-movable cardhaving longitudinal slots therein, said card being arranged between thetapes and the front plate of the case and having a double series ofdigits arranged oppositely thereon between each ofthe slots in thecard,.and a longitudcally-slotted plate fixed tothe front roc , of thecase, so as to cover the card,said plate having ten holes between eachpair of slots, through which the digits on the card maybe seen,substantially as described.

2. In an adding-machine, the combination, with a .case having a slot anda series of tapes having numerals vconsecutively produced thereon, of acard having two series .of nue merals oppositely and alternatelyproduced thereon, and an apertured plate, all arranged for operationsubstantially as set forth.

3. In an adding-machine, the combination, with a case having a slot, aseries .of endless tapes having numerals produced consecutively thereon,and a slotted and apertured plate, of a slotted card having two series`of oppositely and alternately arranged numerals produced thereon, allarranged for opera tion substantially as set forth.

4. In an adding-machine, the combination, with a case having a slot, aseries of endless tapes having numerals produced consecutively thereonand provided with a series of apertures, and pulleys having projectingpins adapted to engage the tape-apertures, of an adjustable slotted cardhaving two series of oppositely and alternately arranged numer- IIOe-rtured plate, all arranged foi-.operation sub stantially asset forth.5. In an adding-machine, the combination,

with a case having a slot, a series ot endless tapes having numeralsproduced eonseeutively thereon and. provided with a series ot apertures,and sets of pulleys having projecting pins, one of which on one pulleyof each set is longer than the others, of an adjustable slotted eardhaving two series ol' oppositely and alternately arranged numeralsproduced thereon, a slotted and apertured plate, and an alarm in thepath of said long pin, all arranged tor operation substantially as setforth.

i5. In an adding-machine, the combination, with a case having a slot, aseries et endless tapes having numerals produced consecutively thereonand provided with a series of apertures, and means for operating thetapes, and sets of pulleys having projecting pins, one of which on onepulley of each set is longer than the others, of an adjustable slottedcard having two series ot' oppositely and alternately arranged numeralsproduced thereon, two of whichone ot' each series-occupy the space of anumeral on the tapes, and the slots of which are in line with theoperating means of the tapes, a slotted and apertured plate theapertures of which align transversely the operating means of the tapesand the slots ot' which align the slots in the card, and an alarm in thepath of the long pin aforesaid, all arranged for operation substantiallyas set forth.

7. In an adding-machine, the combination, with the tape-carrying pulleyshaving projecting pinsin their faces, with one pin in one pulley longerthan the rest, of metal tongues arranged to engage said long pin at eachrevolution ot the pulleys, substantially as set forth.

S. The combination, with a longitudinallymovable slotted Card having thenine digits and cipher arranged oppositely thereon between the slots,ot' a slotted plate to cover the card, said plate having holes betweenthe slots, in which each series ol digits on the card may be made toappear, substantially as described, and for the purpose speeitied.

il. An adding-machine consisting, essentially, of a ease A, having aslotF and shafts IE B therein, the pulleys C, mounted on the shafts andhaving pins a uf, the tapes E,hav ing perforations e and c and havingthree or more series of digits and eiphers thereon, the card J, havingslots j and having opposite series of digits and eiphers, as shown, andthe plate Il, having slots f and holes g therein, substantially asdescribed.

IO. The combination, with the ease A,having slots F and h', the shafts Band B', the pulleys C thereon, and the tapes E upon said pulleys, of thecard J, having the slots j and oppositely-arranged digits and eiphers,as shown, and having a perforation 7L, by means ot which it is moved,and the plate H, having slots f and holes g therein, substantially asdescribed.

Il. The combination, with the case A and tapes E, arranged within theease as shown, ot' the bar D and grooved table or plate D substantiallyas described.

ERI F. JEWETT.

Witnesses:

ISAAC DEAL, S. B. DEAL.

